Piston actuator for grease compressors



May is 192@a 1,585,538

G. W. DE LOACH PISTON ACTUTOR FOR GREASE COMPRESSORS Filed May 1, 1925 9 XNVENTOR wlTNESSEs iwf- George weigeren@ f BY f. t/ f* ."f A

' ATTORNEYS wherein the piston will ay i, ica.

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issasss DE LOACH, 0F INIEWV YDRJK, N. Y.

PISTON ACTUITOR FOR. GREAS GOMPRESSRS.

Application tiled May 1, 1925. Serial No 27,291).

l'lhis invention relates to grease guns or compressors and particularly to an improved piston actuator therefor and has for an object to provide an improved construction function continually in an efiicient manner so that always the desired quantity of grease may be expelled from the compressor.

Another object of the invention is-to pro-4 specifically, is to vpressure on the piston.

In the accompanying drawing- Figure 1 is a longitudinal vertical sectional view through a grease compressor with apiston actuator embodying the invention shown in connection therewith.

Figure 2 is an enlarged fragmentary sectional view through the catchniechanism shown in .Figure 1, the same embodying cer-` tain features of the invention.

Figure 3 is a transverse sectional view through Figure 2 on line 3-3, the same beinv on a reduced scale. v l

eferringyto the accompanying drawing by numerals, l indicates a grease compressor of a well known tvpe which is provided with a discharge mem er 2, a pump structure 3, a greasev carrying cylinder 4 and a piston 5. The unip 3 is provided 'with a plunger 6, whicli) when raised, -produces a rarefaction so that some of the grease is drawn in from the cylinder 4.- through the opening 7 and is later forced out through the outlet 2. A spring pressed disk 8 bottom in which the plunger 6 functions. so that if there'should be too great a resistance at any point, the disk 8 may move down 'against the action of the slpring and thereby prevent breakage while a owing the grease to'gradually pass out through member 2.

e various devices'just described are old and, therefore, form no part of the present invention except in com ination. In addition to .the parts just described, there is causing the spring' to normally closes the provided a rod 9 adapted to guide the piston 5 but instead of using the rod as heretofore used, asimilar shaped rod is provided but formed'with a number of notches 10 for receiving certain parts of the catch 11. This catch co-acts with a spring 12 lfor be maintained under tension and the spring in the piston 5 to press against-the grease and maintain a continuous pressure in the opening 7 so that as soon as the vplunger 6 has turn acts to cause been moved upwardly out of the way the grease will provided.

In providing the piston 5, instead of using thepiston as heretofore provided, a cup 13 is provided which faces opening 7 instead of the opposite direction as heretofore used. A vent 14 isalso provided in the piston 5, said vent being of any suit-able structure, as for instance, an ordinary pet cock. The catch 11 is of a special structure as shown particularly in Figures 2 and 3. From these figures it will be observed that the catch 11 is' quickly move into the space'thus provided with an enlarged annular portion l5 which is preferably roughened or kiiurled at 16. Extending from the enlarged portion 15 is a tubular sleeve 17 said enlarged portion 15 and sleeve 17 having a bore whereby the device may be slidingly mounted on the sha-ft 9. Preferably, an/annular depression 18 is provided in the enlarged portion 15, said depression receiving one end of a spring 12 and thereby holding the same properly located so that when the catch 11 is moved, a. proper tension may be produced in the spring 12. The enlar ef ment 15 is provided with a pair `of radial bores 19, each bore being provided with a sliding member 20 having a projecting catch bolt 21 adapted to fit into any of the notches 10. A spring 22 acts on each of the members 20 for causing the same to move toward the shaft or rod 9 while a threaded plug 23 acts to hold the spring 22 so that it will always function. provided at the inner end of member20 so as to guide the bolt 21 in its back and forth movement.

In operation, when the com ressor is empty, the end 25 is removed an then the enlargement 15 grasped and turned for a quarter of a revolution. This will cause the vbolts 21 to move back against the action of A. guiding member 24 is `so that it will travel for quite a lametrically opposite catch the uninterrupted surface of the rod 9. The catch 11 is then slid o the rod as well as the piston 5. -A new supply of grease is then rovided in the replace( and then the catch 11 of spring 12 re-mounted on the rod 9. The'catch 11 is usually pressed until the bolts 21 interlock with theb first. notch 10. After this haS been done, the. pet cock 14 is opened unless itis already open and the air in front of the piston 5 is allowedto escape. After the parts have been adjusted as described, the end 25 is replaced and the compressor is then ready for use. After an appreciable amount of grease has been used, end 25 is removed and the catch 1 1 pushed forwardly 'until it engages one of the notches 10 near the opening 7. Usually the catch is forced forwardly as far as it will go and this will put the piston under an appreciable tension distance before it is necessary to again shift or adjust the catch 11.'

What l claim is:

1. The combination with a grease compressor provided with a cylinder and a piston arranged ranged in said cylinder formed with a plurality of notches on diametrically opposite sides, a s ring tor moving the piston in said cylin er, and a catch device for maintaining said spring under compression, said catch device being provided with a pair of bolts capable of moving radial said bolts being adapted to snap into said respective notches as the cylinder 4f, piston 5 .end bearing against cylinder, of

Within the cylinder, of a rod arrasante catch is moved along the rod for maintaining the spring under tension, said 4catch bolts being adapted to be retracted when the catch device is rotated so that the catch boltswill be positioned at right angles to the notches whereby the catch device may be moved od said rod. p

2. The combination with a grease compressor provided with a stationary rod extending longitudinally of the cylinder of the compressor, said rod being formed with notches and a piston slidingly mounted on said rod, of a catch slidin'gly mounted on said rod and formed with catch bolts adapted to project into the respective notches according to the position of the catch along the rod, anda spring held under compression Aby said catch, said spring having one said piston and acting as means for propelling the piston.

3. The combination with a grease coinpressor provided with a cylinder, a piston arranged in said cylinder and a stationary rod for the piston positioned in said a spring positioned to act against the p'ston and give the same a tendency to move along said rod for compressing the grease inthe cylinder, said spring presenting the sole power means for moving the piston, and a catch surrounding said rod and manually movable along the rod for maintaining Said spring under compression, said catch being formed with means for gripping said rod.

' GEORGE W. DE LOACH. K

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